Daydream about smile in ray of light (8)

I believe the answer is:

moonbeam

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'ray of light' is the definition.
(moonbeam is a kind of ray of light)

'daydream about smile' is the wordplay.
'daydream about' becomes 'moon' (synonyms. I am not sure about the 'about' bit.).
'smile' becomes 'beam' (beam can mean to smile).
'moon'+'beam'='MOONBEAM'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for moonbeam that I've seen before include "Night light?" , "Ray, not the brightest" , "Pale ray of light" , "reflective illumination" , "A lunar ray of light" .)

I've seen this clue in The Irish Times.

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